Fire-box of steam-generators.



PATENTBD AUG. a. 1905.

D. CROWTHBR.

FIRE BOX 0F STEAM GBNERATORS.

APPLIUATION FILED NOV. 1,- 1904.

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D. CROWTHER. FIRE BOX 0I' STEAM GENERATORS.

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PATBNTED AUG. 8, 1905.

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APPLICATION FILED INGV.v 1, 1904.

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UNITED STATES PATENT ornion.

DAVID CROWTHER, OF LEEDS, ENGLAND, ASSIGNOR TO GLOVERS WATER TUBE BOILERCOMPANY LIMITED, OF LEEDS, ENGLAND.

FIRE-BOX OF STEAM-GENERATOBS.

Specification of Letters Patent.

Patented Aug. 8, 1905.

Application filed November l, 1904. Serial No. 230,928.

To all whom, it may concern:

Beit known that I, DAVID CRow'rHER, a subject of the King of GreatBritain and Ireland, and a resident of Leeds, in the county of York,England, have invented a certain new and useful Improvement in Furnacesor Fire-Boxes and Combustion-Chambers of Steam-Generators, of which thefollowing' is a specification.

This invention relates to a new construction of the furnaces orfire-boxes and combustionchambers of steam-generators, more particularlyto those of the locomotive type, and has for its objects to increase theefficiency and power or steaming capacity of the steam-generator andthedurability of the furnace or fire-box or the 'combustion-chamber.These objects I effect by forming the sides or two or more of the sidesof the same of a row of water-tubes, each tube being divided by astraight or curved internal division-plate into front and back spaces,the water ascending the front or fire side space and descending in Atheback or rear space, and by fitting the upper ends of the water-tubesinto the roof-plate along or near the sides or edges of the saine.

This invention is illustrated by the accompanying drawings, showing itsapplication to a locomotive-boiler.

Figure 1 is a longitudinal section, theleft side of Fig. 2 across-section on line A B of Fig. 1 looking toward the front or tubeplate end of the lire-box and the right side of Fig. 2 being across-section on line C D of Fig. 1 looking toward the back or firingend ofthe fire-box. Figs. 3, 4, and 5 are cross-sections of thewater-tubes. Figs. 6 and 7 are part cross-sections near the side of thefire-box roof, showing the arrangement of the upper ends of thewater-tubes where fitted into the roof; and Fig. 8 represents a view ofa divisionplate.

In all the figures the same reference-letter indicates the same orcorresponding part.

c indicates the water-tubes. As shown in Figs. 2 and 8, thesewater-tubes are divided into a front or upflow space 5 and a back ordowniow space o by a straight internal division-plate d. In Fig. 4 thisdivision-plate is formed curved or S-shaped to give a slight spring orside elasticity to the plate, so that the plate CZ can be adjusted topresent one of the spaces only and fully to the fire side and the otherfully away to the back side. The

.the roof of the fire-box.

desired position is as shown by the full lines in Fig. 3 and not asindicated by the dotted lines, whatever may be the position rotativelyin which the tube c itself has been fitted in To obtain this adjustability of the straight division-plate while retaining sufficienthold against accidental dis placement, I make two or more inclined slitsa in the plate near the edges and expand the metal outward. In Fig. 5the internal division-plate has for cross-section a complete circle-thatis, it forms an inner tube which, however, is placed eccentricallywithin the tube c as far away as possible from the fire side. Thedivision-plate l (see Fig. 2) stops short two or three diameters lengthfrom the bottom of the tube, the lower end of which is closed by avalve-fitting or screw-plug e, which can be unscrewed for cleaning oremptying the sediment. If the tubes are reduced in diameter or crankedor bent at their lower ends as hereinafter described for the upper ends,the lower ends may be fitted into a common water-box.

As shown in Figs. 1 and 2, the longitudinal sides of the fire-box, thefront end below the flame-tube plate, and the'rear end on each side ofthe firing-door are formed by placing the water-tubesclose together sideby side, with the exceptions hereinafter referred to, and with thedivision-plates adjusted in the direction of the line of the wall formedby the row of tubes. The roof-platef of the fire-box is extended on eachside up to the outer or boiler shell-plate g and riveted to the same,while the outer shell-plate g is carried down on each side to somewhatbelow the level of the firegrate /L and acts as a casing to the tubes a,forming the fire-box. The front and rear outer or shell plates i' and jare carried down in a similar manner, a rectangular ring plate z,between the outside of the water-tube firebox and the shell-casing,providing a space which may be filled with non-conducting material tolessen or prevent loss by radiation.

A similar narrow foundation ring or bar c on the inner side of the tubest provides a support for the fire-grate z and ash-pan Z..

In order to carry the fire-arch m, some of the tubes c, forming thelongitudinal sides of the hre-box, are spaced slightly apart, so as toallow of the insertion of vertical supportbars n, carried by bolts fromthe outer shell or casing plates g, and the bars n carry inclined sidebars 0, on which the abutmentsp,

Fig. 2, of the fire-arch m rest.

The upper ends of the water-tubes are inserted in and through the roofof the fire-box and may be carried therefrom either by merely screwingin, as shown in Fig. 2, or by inside or outside ferrules. (See Figs. 6and 7 In order to avoid completely cutting through the roof-plate orweakening ittoo much, the upper ends of the tubes a may be reduced indiameter, as shown in Figs. I and 2, or alternate tubes may have asingle or double bend to right or left, as illustrated in Figs. 6 and 7.Further, where the upper ends of the tubes are reduced in diameter theroof-plate may be supported by welding a short bolt q, Figs. l and 2, tothe upper end of the internal division-plate Z and securing this by nutsto a bar fr, carried by the roofgirders s, the division-plate beingengaged to the top of the tube, which is engaged to the roof-plate.

The lower end of the flame-tube plate is iianged back at jz/ and thendown and riveted to the front outer or shell plate vl, Fig'. 1, in orderto admit of the insertion of the upper ends of the tubes 0 which serveto produce an upward current of the water close to the tubeplate, andthus facilitate the disengagement of steam.

The open spaces left between the upper ends of the tubes a by reducingtheir diameters or by bending them to the right or left may be coveredby fire-brick blocks t, resting on the angle or bent plates a, rivetedtothe side shell-plates g. The space between the back of the tubes a andthe` side shell-plates g also may be filled in by non-conductingmaterial, while the space above and below the fire-hole o, unoccupied bywater-tubes, is filled in by fire-brick blocks w.

In certain cases- 21s, for example, where it is preferred to place thetubes a slight distance apart in addition to narrowing their upper endsto prevent too great a reduction of the strength of the roof-plate alongthe line I where the upper ends of the tubes are inserted-the open spacemay be blocked by triangular metal or brick blocks on the outer side, asillustrated in Fig. 3.

In the case of cylindrical vertical boilers the fire-box is formed ofdouble-flow water-tubes of the construction above described placed closetogether side by side, forming a cylindrical wall, the internaldivision-plates being placed tangentially with respect to the circlepassing through the centers of the tubes. Theinsertion of the upper endsof the tubes is effected as indicated in Figs. 6 and 7, the roofplatebeing connected to the vertical shell-plate of the boiler.

Having now described my invention, what I claim as new, and desire tosecure by Letters Patent, is-' l. In fire-boxes of steam-generators, thecombination of two side rows and two end rows of water-tubes a havinginternal division-plates Z and screwed bottom plugs e, with a roof-platef into and through which the upper ends of the tubes a are fitted, twoside shell-plates g, rear-end shell-plate j, flametube plate to whichthe roof-platefis riveted, horizontal bottom iiange g/ to the fiametubeplate and front-end shell-plate a' riveted together, foundation-bars e,vertical supportbars 11 and fire-arch m.

2. In the fire-boxes of steam-generators, the combination of two siderows and two end rows of water-tubes a having internal division-plates Zand screwed bottom plugs e, a,

roof-platef into which the upper vends of the tubes a are fitted, twoside shell-plates g, rearend shell-plate j, flame-tube plate to whichthe roof-plate f is riveted, horizontal bottom flange 1/ to the fronttube-plate a; and frontend shell-platea riveted together, andfoundation-bars 3. In the fire-boxes of steam-generators, thecombination of two side rows and two end rows of water-tubes a havinginternal division-plates d and screwed bottom plugs e, a roof-plate finto which the upper ends of the tubes a are fitted, two sideshell-plates g, rearend shell-plate j', dame-tube plate to which theroof-plate f is riveted, horizontal bottom ange y to the tube-plate .frand front-end shell-plate 4. In the fire-boxes of steam-generators,`

the combination of two side rows and one end row of water-tubes a havinginternal division-plates l and screwed bottom plugs e, a roof-plate finto and through which the upper ends of the tubes t are fitted, twoside plates g, a rear-end plate j', flame-tube plate a', foundation-barz, vertical support-bars n, and fire-arch m.

5. In the fire-boxes of steam-generators, the combination of two sideand one end row of water-tubes a having internal divisionplates l andbottom screwed plugs e, a roof'.- plate f into and through which theupper ends of the tubes t are fitted, two side shellplates g, a rear-endshell-plate j, and flametube plate fr.

6. In the fire-boxes of steam-generators, the combination of two siderows and two end rows of water-tubes (t having internal division-platesl and screwed bottom plugs e, a roof-platef into and through which theupper ends of the tubes a are fitted, two side shell-plates g, and oneend shell-plate.

7. In the fire-boxes of steam-generators, the combination of two siderows of watertubes a having internal division -plates l screwed bottomplugs e, with a roof-plate f, ame-tube plate fr, Vertical support-barsa, and fire-arch m.

8. In the fire-boxes of steam-generators, the combination of two sideand one end row of water-tubes a having internal divisionplates d. andscrewed bottom plugs e, with a roof-plate f, outer shell-plates g, e',and Hametube plate having bottom iiange y.

9. The combination of a boiler, with a fireboX having a rooic and a wallcomprising the shell of said boilerretubes set in the part of said shellentering into said wall, and water-tubes providing separate passages forthe downward and upward flow forming sides for said fire-box and set inthe portion 'of said shell forming the roof of said fire-box.

10. rIhe combination of a {ire-box, with a boiler having a shell formingthe roof of said fire-box, water-tubes in sides of said lire-box and setin said roof, and bolts connected with said tubes and supported withinsaid shell.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

DAVID CROWTHER.

Witnesses:

J. CLARK JEFFERSON, ERNEST JAcKsoN.

